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Homemade Heat Sink
The aluminum upper guide used on sliding doors makes a fine heatsink when it’s cut to length and glued to a motor, and in some cases to a motor mount. Aluminum-filled epoxy may be the best adhesive. You could also try curving the base of the heat sink to provide more contact with the motor case or mount. Two or three sinks will get rid of the heat more efficiently than just one. Adapted from...
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